Geography

Classification | Types of Planets and their Characteristics

len Alfred Ajibola - Tue, 31st December, 2019 @ 12:16: PM

Topics in Geography

Branches of Geography: Physical and Environmental Geography Geography Scheme of Work, SS1, First Term Geography Scheme of Work, SS1, Second Term Geography Scheme of Work, SS1, Third Term Classification | Types of Planets and their Characteristics Planets of the Solar System with their Characteristics Functions of the Atmosphere Layers of the Atmosphere Solar System in Geography Atmosphere: Composition of the Atmosphere Geography, Types and Branches of Geography Characteristics and Examples of Igneous, Sedimentary and Metamorphic Rocks


Academic Questions in Geography

Please check out our Test Your Knowledge page to see all Questions and Answers

The following are true concerning the gas planets except _____.

  • A. Neptune is an example of a gas planet

  • B. They are also referred to as jovian planets

  • C. They have rings around them

  • D. They are smaller in size when compared to earth

  • E. They are also referred to as gas giants

  • F. They are composed mainly of hydrogen and helium gas

The following are characteristics of terrestrial planets except _____.

  • A. They have rocky surfaces

  • B. Their surfaces are compact in nature

  • C. They have no rings around them

  • D. Uranus is an example of terrestrial planet

  • E. They rotate slowly around their satellites

  • F. The have few number of satellites

Planets can be classified under the following headings except _____.

  • A. Size

  • B. Shape

  • C. Mass

  • D. Time of discovery

  • E. Composition

  • F. Relative positioning to the sun

The following are branches of physiography except _____.

  • A. Oceanography

  • B. Geomorphology

  • C. Envirogeography

  • D. Paleography

  • E. Glaciology

  • F. Bio-Geography

Sedimentary rocks are formed from the following processes EXCEPT _____.

  • A. By the transformation of a protolith

  • B. By the transportation and subsequent deposition of weathered remains of pre-existing rocks

  • C. By the accumulation and lithification of detrital rocks

  • D. By their precipitation from solution

  • E. By processes resulting from biogenic activity

  • F. All of the above

The following are examples of igneous rock EXCEPT _____.

  • A. Tuff

  • B. Gneiss

  • C. Granite

  • D. Pegmatite

  • E. Gabbro

  • F. Pumice

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Classification of Planets:

The categorized planets are quite popular although we still have some other planets that are yet to be categorized. For instance the planets makemake and eris are examples of uncategorized planets.

Please read on all the Planets of the Solar System and their Characteristics here.

The planets can be classified or grouped under the following headings:


1. By Composition

The types of planets based on their composition are:

i. Terrestrial or Rocky Planets: They are Mercury, Venus, Earth and Mars. They are called terrestrial or rocky planets for the following reasons:

A. They have a rocky and compact surface.

B. They have no rings around them.

C. They have a few numbers of satellites.

D. They rotate slowly around their axis.

Please read on Rocks and Types of Rock (with Images) here.

ii. Gas or Jovian Planets: They include Jupiter, Saturn, Uranus, and Neptune. They have the following features:

A. They are called Jovian planets because they are bigger in size when compared to earth.

B. They are composed mainly of hydrogen and helium gas, hence the name gas planets or gas giants.

C. They rotate rapidly.

D. They have many satellites.

E. They have rings around them.

Note: Venus Earth and Mars have atmospheres containing oxygen while mercury barely has an atmosphere.

Please read on the Atmosphere and its Composition here.

Below is an image that shows the classification of planets:
Classification of Planets - Len Academy


2. By Size

i. Small Planets: They have a diameter lesser than 13,000km. They include Mercury, Venus, Earth and Mars.

ii. Giant Planets: Also referred to as the gas giants, they have a diameter greater that 48,000km. The gas giants include Jupiter, Saturn, Uranus and Neptune.



3. By their relative positioning to the sun

i. Inner planets: They are closer to the sun. They include Mercury, Venus, Earth and Mars.

ii. Outer planet: They are farther away from the sun. They include Jupiter, Saturn, Uranus, Neptune.

Please read on the Solar System here.



4. By their relative position to the earth

i. Inferior planets: They appear to be closer to the sun than the earth. When viewed from the earth, they do not always appear in full view. They include Mercury and Venus.

ii. Superior planets: They appear to be farther away from the sun than the earth. They will always appear in full view from the earth. Examples of the superior planets are Mars, Jupiter, Saturn, Uranus and Neptune.

You can read on the Functions of the Earth's Atmosphere here.



5. Based on the time of discovery

i. Classical Planets: They were discovered a very long time ago and can be seen without a telescope. They include Mercury, Venus, Earth, Mars, Jupiter and Saturn.

ii. Modern planets: They were discovered in recent times and cannot be seen with an unaided eye. They are Uranus, Neptune and Pluto.



6. Based on their Mass

Dwarf Planets:

Dwarf Planets are smaller in mass when compared to other planets. At present we have 5 dwarf planets. They are: Pluto, Ceres, Eris, Haumea and Makemake.

Note: The dwarf planets are considered as uncategorized planets. They are currently located in a region of the solar system called the Kuiper Belt.

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Alfred Ajibola is a Medical Biochemist, a passionate Academician with over 7 years of experience, a Versatile Writer, a Web Developer, a Cisco Certified Network Associate and a Cisco CyberOps Associate.


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Amazing facts in Geography

The universe has a color named cosmic latte

An earthquake is more likely to happen in Japan than any other country

Only 2 countries have the color purple in their national flag. Both countries are:

Nicaragua and Dominica

With 221,800 islands, Sweden is believed to have more islands than any other country in the world.

The shortest war in history lasted for only 38 minutes

Australia is both a country and continent and it has the highest number of reptiles in the world. (Over 750 different species of reptiles)

Earth is the only planet that contains water on it's surface. In fact, the percentage of water on Earth is greater than that of land.

Water: 71%

Land: 21%

Salt water or Saline water makes up about 97% of Earth's water. It comprises majorly of ocean and sea waters

Metal actually rains on planet Venus

Planet Mars appear brownish or reddish because it's covered with iron rust


NOTABLE POINTS IN Geography

We have 3 main types or classes of rock based on how they are formed. These are:

1. Igneous Rock

 

2. Sedimentary Rock

 

3. Metamorphic Rock

 

Igneous rocks are formed when molten substances below the earth surface cools down and solidifies. These molten substances are called magma or lava. Magma can be derived from melting of existing rocks on the earth crust.

The solidification of molten magma into igneous rock may be below the earth's surface (intrusive) or on the earth's surface (extrusive), giving rise to the two types of igneous rock.

  • Intrusive Igneous Rock: These are igneous rocks that crystallizes below the earth’s surface. They generally cool slowly during the process of solidification and tend to produce large crystals.

    Intrusive Igneous Rock are also referred to as Plutonic Igneous Rock. Examples are gabbro, granite and pegmatite.

  • Extrusive Igneous Rock: They are igneous rocks that form when molten magma erupts on top of the earth's surface. They cool down and solidify quickly, producing small crystals in the process.  Sometimes, the molten magma cools so quickly, allowing no time for crystals to grow. This rapid cooling results in the formation of an amorphous glass.

    Extrusive Igneous Rock are also referred to as Volcanic Igneous Rock. Examples are basalt, rhyolite and scoria.

Sedimentary rocks amount to about 76% of the earth's surface. They can be formed in different ways. These are:

  • By the deposition of the weathered remains of pre-existing rocks and their subsequent transportation and deposition. Sedimentary rocks formed in this way are known as clastic sedimentary rock.

  • By the accumulation and lithification of sediment or detrital rock.

  • By their precipitation from solution. Sedimentary rocks formed in this way are known as chemical sedimentary rock.

  • As a result of biogenic activities. Sedimentary rocks formed in this way are known as organic sedimentary rock.

Please read more on types of rocks here

Metamorphic rocks are formed from the transformation of an existing rock or original rock called protolith. The protolith may be an igneous rock or a sedimentary rock or another older metamorphic rock. Their transformation may be physical or chemical, requiring great heat and pressure.

Metamorphic rocks are always more dense and also less likely to be broken down by erosion when compared to igneous and sedimentary rocks. They make up about 12% of the earth crust and can also be formed beneath the earth surface.

Examples of metamorphic rocks are schist (a converted basalt), quartzite (a compressed sandstone), and marble (a compressed limestone or dolomite).